Patent US1821171A successfully refreshed from Google Patents.
US1821171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orthodontic appliance
Assignee: Individual
•
Filing: 1929-10-28
•
Granted: 1931-09-01
•
Expires: 1949-10-28
Abstract
No abstract record available.
Inventors
- 👤 Spencer R Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:11
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49567; Y10T29/49568
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-08-31 | 1935-03-02 | 1935-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-08-31 | 1939-03-02 | 1939-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-08-31 | 1943-03-02 | 1943-09-01 | $7700.00 | Window Closed / Lapsed |